---Do you know ________?---Sorry, but if he ________ back, I ________ you know as soon as possible．A.when will he be back; es; will letB.when he will be back; will e; will letC.what time will he be back; will e; letD.what time he will be back; es; will let
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D解析宾语从句用陈述句语序；主句为一般将来时，if引导的从句用一般现在时表将来。